Valby ( ) is one of the 10 official districts of Copenhagen Municipality, Denmark. It is in the southwestern corner of Copenhagen Municipality, and has a mixture of different types of housing. This includes apartment blocks, terraced housing, areas with single-family houses and allotments, plus the remaining part of the old Valby village, around which the district has formed, intermingled with past and present industrial sites.

Copenhagen Municipality, also known in English as the Municipality of Copenhagen, located in the Capital Region of Denmark, is the largest of the four municipalities that constitute the City of Copenhagen, the other three being Dragør, Frederiksberg, and Tårnby. The Municipality of Copenhagen constitutes the historical city centre and the majority of its landmarks. It is the most populous in the country with a population of 656,787 inhabitants, and covers 86.4 square kilometres (33.4 sq mi) in area,. Copenhagen Municipality is located at the Zealand and Amager islands and totally surrounds Frederiksberg Municipality on all sides. The strait of Øresund lies to the east. The city of Copenhagen has grown far beyond the municipal boundaries from 1901, when Frederiksberg Municipality was made an enclave within Copenhagen Municipality. Frederiksberg has the largest population density of the municipalities of Denmark.